气候变化领域集成服务门户(CCPortal): Last glacial maximum climate based on cosmogenic Be-10 exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau

CCPortal

DOI	10.1016/j.quascirev.2013.09.004
	Last glacial maximum climate based on cosmogenic Be-10 exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau
	Xu, Xiangke; Hu, Gang; Qiao, Baojin
通讯作者	Xu, XK (通讯作者)
发表日期	2013
ISSN	0277-3791
起始页码	91
结束页码	101
卷号	80
英文摘要	Fully understanding the timing and climate of Last Glacial Maximum (LGM) is still lack in the head of the Tashkurgan Valley, northwest Tibetan Plateau (TP). The recent improvements in cosmogenic Be-10 exposure dating and glacier modeling present an opportunity to estimate the LGM climatic conditions. In the paper, we investigated the moraines and used the 10Be exposure dating on the moraine boulders to constrain the timing of the LGM, the Kuzigun glacial stage in the head of the Tashkurgan Valley. Then, we used a coupled mass-balance and ice-flow model to quantify the paleoclimate from past glacier extents constrained by mapped and dated Kuzigun glacial moraines in the area. We showed that the glaciers terminated at an elevation of 4100-4200 m asl during the Kuzigun glacial stage and the glacial stage occurred during or slightly before 15-23 ka, corresponding to the timing of the global LGM. The modeled mass balances indicated that present-day equilibrium line altitude (ELA) ranges from 5150 to 5250 m asl, and LGM ELA is between 4550 and 4600 m asl in the area, suggesting an ELA lowering of similar to 600 m during the LGM. Model results suggested that the temperature during the LGM in the head of the Tashkurgan Valley is 5-8 degrees C colder than today, considering a 30-70% reduction in precipitation compared to today. The paleoclimate estimates are generally consistence with previous studies that showed the LGM climate was colder and drier than today on the TP. (C) 2013 Elsevier Ltd. All rights reserved.
关键词	QUATERNARY GLACIATION PLEISTOCENE GLACIATIONS PRODUCTION-RATES UINTA MOUNTAINS ENERGY-BALANCE MASS-BALANCE HUNZA VALLEY NEW-ZEALAND EAST-ASIA 21 KA
英文关键词	Tashkurgan Valley; Last Glacial Maximum; Cosmogenic Be-10 exposure dating; Glacier modeling; Paleoclimate
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000328521100006
来源期刊	QUATERNARY SCIENCE REVIEWS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258104
推荐引用方式 GB/T 7714	Xu, Xiangke,Hu, Gang,Qiao, Baojin. Last glacial maximum climate based on cosmogenic Be-10 exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau[J]. 中国科学院青藏高原研究所,2013,80.
APA	Xu, Xiangke,Hu, Gang,&Qiao, Baojin.(2013).Last glacial maximum climate based on cosmogenic Be-10 exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau.QUATERNARY SCIENCE REVIEWS,80.
MLA	Xu, Xiangke,et al."Last glacial maximum climate based on cosmogenic Be-10 exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau".QUATERNARY SCIENCE REVIEWS 80(2013).